metal contents viz., cu, ni, co, zn and cd in sediment cores recovered from the vembanad lake, the largest estuarine-lagoonal system on the west coast of india, were analysed to understand the pollution levels and the impact on the coastal environment. of the three cores studied, vc-10 shown enrichment in all metals compared to other cores, as it is located in the vicinity of industrial area. f...

Abstract Rack-and-pinion drives are the preferred option in machine tool sector when long ranges of motion and high loads involved. However, their shortcomings particularly include deficiencies achievable positioning path accuracy. The backlash as one main issues is well described literature numerous solutions to reduce its negative effects exist. In contrast, there a lack regarding scientific ...

Automated storage and retrieval systems (AS/RSs) are material handling systems that are frequently used in manufacturing and distribution centers. The modelling of the retrieval–travel time of an AS/RS (expected product delivery time) is practically important, because it allows us to evaluate and improve the system throughput. The free-fall-flow-rack AS/RS has emerged as a new technology for dr...

Data center infrastructures are highly underutilized on average. Typically, a data center manager computes the number of servers his facility can host by dividing the total power capacity of each rack by an assigned “peak power rating” for each server. However, this scheme suffers from the weakness of all static provisioning schemes – it does not account for the variability of load on the serve...

1569-190X/$ see front matter 2011 Elsevier B.V doi:10.1016/j.simpat.2011.02.008 ⇑ Corresponding author. E-mail address: [email protected] (S.S. Her In this paper, simulation based performance analysis of an autonomous vehicle storage and retrieval system (AVS/RS) is presented. AVS/RS represents relatively a new system for automated unit-load (UL) storage based on autonomous vehicle (AV) t...

the contamination of riverbed sediments by heavy metals has assumedserious problems due to their toxicity and accumulative behavior. the present studyinvestigated the concentrations of heavy metals from the bottom sediments of shitalakhyariver to understand the level of contamination and their distribution. the averageconcentrations of heavy metals al, k, ca, mg, fe, as, cu, co, cr, and zn are ...

Receptor for activated C kinase (Rack)-1 is a protein kinase C-interacting protein, and contains a WD repeat but has no enzymatic activity. In addition to protein kinase C, Rack-1 also binds to Src, phospholipase Cgamma, and ras-GTPase-activating proteins. Thus, Rack-1 is thought to function as a scaffold protein that recruits specific signaling elements. In a cytokine signaling cascade, Rack-1...

Automated Storage and Retrieval Systems (AS/RSs) are warehousing systems that are used for the storage and retrieval of products in both distribution and production environments. This paper presents an open-rack structure with unidirectional-upward mobile loads within the rack, for miniload AS/RS, in which the stacker crane is only used for the retrieval operations, and the storage operations a...

This paper shows how simulation of screw rotor profile manufacturing can be used in the design phase to assess profile alternatives. To do this, variations in manufacturing parameters are studied to illustrate how these deviations affect different rotor profile shapes and the resulting rotor pair clearances. INTRODUCTION Clearances between rotors in a twin screw compressor play a key role in de...

A multi-bale handling unit offers an advantage for the efficient hauling of round bales. Two empty racks on trailers are left at a satellite storage location loading while truck tractor delivers two loaded to biorefinery, thus uncoupling and operations increasing efficiency both. The projected 10 min trailer exchange time equals unload biorefinery achieved by lifting off full replacing them wit...